Merino Thermal OTC Sock Simms’ Thermal OTC Socks stoke a fire under your feet thanks to premium merino wool—for trusted moisture management and appreciated anti-microbial performance. Socks are finished with nylon, polyester, and LYCRA® stretch for a full suite of comfort-enhancing benefits. The high-loft, over the calf design maximizes warmth while Right Angle® arch support improves overall support across variable trail and river conditions. Made in the USA. FEATURES & BENEFITS: High-loft, over-the-calf design for maximum warmth Right Angle® arch support Premium Merino wool for moisture management & odor prevention FABRIC TECH: 75% Merino wool, 20% nylon, 3% polyester, 2% Lycra® APPROX. WEIGHT: 6.2 oz. / pair Sizes: M-XL (M: 6-9, L: 9-12, XL: 12+)